ETQ-P Automotive Power Choke Coils Panasonic ETQ-P Automotive Power Choke Coils are low-profile, metal composite core devices that provide high heat resistance and high reliability over a broad temperature range. Panasonic ETQ-P Series Automotive Power Choke Coils are AEC-Q200 Automotive qualified and RoHS compliant. Applications include noise filters, boost-converters, and DC/DC buck-converters.